47509031 has 4 divisors (see below), whose sum is σ = 47625600. Its totient is φ = 47392464.

The previous prime is 47509009. The next prime is 47509039. The reversal of 47509031 is 13090574.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 47509031 - 2¹⁰ = 47508007 is a prime.

It is a super-2 number, since 2×47509031² = 4514216053117922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 47508985 and 47509003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47509039) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57671 + ... + 58488.

It is an arithmetic number, because the mean of its divisors is an integer number (11906400).

Almost surely, 2^47509031 is an apocalyptic number.

47509031 is the 3083-rd centered decagonal number.

47509031 is a deficient number, since it is larger than the sum of its proper divisors (116569).

47509031 is a wasteful number, since it uses less digits than its factorization.

47509031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116568.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 47509031 is about 6892.6795225079. The cubic root of 47509031 is about 362.1807726285.

The spelling of 47509031 in words is "forty-seven million, five hundred nine thousand, thirty-one".